#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main()
{
	int a, b = 0;
	int count = 0;
	scanf("%d%d", &a, &b);
	for (int i = 0; i <32; i++) 
	{
		if (((a >> i) & 1) != ((b >> i) & 1))
		{
			count++;
		}
	}
	printf("%d", count);
	return 0;
}